Defining, controlling and measuring crime
Distinguish crime from deviance, compare formal and informal controls, classify crime types and evaluate crime data.
Section 6.1 · Defining, controlling and measuring crime
Exam scope and assessment notes
This lesson is written for Cambridge IGCSE Sociology 0495. It maps section 6.1 in the 2025–2027 Version 3 and 2028–2030 Version 1 syllabuses; Cambridge reports no significant teaching changes for 2028–2030. Use current, credible and age-appropriate examples from more than one society. Check local law and school policy before discussing sensitive or legally restricted family, marriage, crime or punishment examples. Do not ask learners to disclose personal experiences. These lessons present sociological explanations for analysis, not endorsements of political positions or stereotypes.
Before you begin
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Before you start: Which statement best distinguishes crime from deviance?
What you will learn
- Explain crime and deviance and their relativity across time, culture, situations and societies.
- Assess formal agencies and informal agencies of social control and their methods.
- Compare violent, property, corporate, expressive, instrumental, gang, green, global, cyber, hate and domestic crime.
- Evaluate official statistics, self-report studies and local/national victim surveys, including unreported and unrecorded crime.
Definitions and control
Crime is behaviour prohibited by law in a particular jurisdiction; deviance breaches a social norm and may be lawful. Both definitions can vary across societies, cultures, situations and time.
Formal control includes police, courts, armed forces, government and penal systems; informal control includes family, education, work, peers, traditional and digital media, and religion. Compare how agencies work and their effectiveness without assuming that control is always legitimate or equally experienced.
Types and measurement
Crime categories include violent, property, white-collar or corporate, expressive, instrumental, gang, green, global or organised, cyber, hate and domestic crime. Categories can overlap and should be defined precisely.
Official statistics, self-report studies and victim surveys each measure different parts of crime. Incidents may be unreported by victims or unrecorded by agencies. Compare their definitions, samples, recall, access and coverage before interpreting a change.
Sources for this lesson
Pause and explain
Why can official crime statistics change even when underlying behaviour does not?
Worked example
Official police data show fewer recorded thefts after a reporting process changes. Explain two possible interpretations.
Show the worked solution
- Underlying theft may have fallen.
- The process may have changed reporting, recording or classification, so fewer incidents enter the statistics.
- Compare with victim surveys, self-report evidence and consistent definitions before deciding.
Answer Recorded crime is not identical to all crime experienced; multiple measures can help assess the pattern.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A city sees an increase in reported domestic crime after a confidential support service opens. Give two explanations and an ethical evidence source to compare.
Give me a hint
Reports may change because behaviour or reporting access changed; protect participant safety.
Compare my reasoning
- The underlying level of crime may have changed.
- Greater trust or safer access may increase reporting even if underlying incidents are stable.
- Compare carefully aggregated official records with a safe, confidential victim survey designed with specialist safeguards; do not expose individuals.
The rise could reflect more incidents or improved reporting. A protected comparison may help, but this sensitive area requires specialist ethical design and must not compromise safety or confidentiality.
Look for these in your work
- Offers two interpretations
- Distinguishes incidents from reports
- Includes safeguarding and confidentiality
Compare official statistics and self-report studies for investigating cybercrime among young people.
Give me a hint
Consider recording, disclosure, definitions and access.
Compare my reasoning
- Official statistics can show recorded cases but depend on reporting, detection and classification.
- Self-report studies may reveal unrecorded behaviour but depend on honest answers, clear definitions and safe participation.
- Compare coverage and ethical safeguards and avoid treating either source as complete.
Official data and self-reports reveal different parts of the picture. Both have gaps, and cybercrime definitions and disclosure risks must be handled carefully.
Look for these in your work
- Explains different coverage
- Names a limitation for each
- Protects participants
A behaviour is legal in one place but strongly disapproved of by a local group. Explain how it could be classified sociologically.
Give me a hint
Keep legal and social-norm definitions separate and specify the context.
Compare my reasoning
- If the behaviour does not break local law, it is not crime under that jurisdiction's current definition.
- If it breaches a social expectation, some people may treat it as deviant in that setting.
- Record whose norm is being described, when and where, because laws and social judgments can vary.
It may be socially deviant for a particular group or situation while remaining legal. The classification depends on jurisdiction and norm, not a universal label.
Look for these in your work
- Separates law from norms
- Names the relevant group/context
- Recognises variation
Common mistakes
- Treating all deviance as crime
- Assuming a crime category has the same meaning everywhere
- Treating official statistics as the total amount of crime
- Assuming victim surveys contain every unreported incident
What can you explain now?
Why can official crime statistics change even when underlying behaviour does not?
Compare with the explanation
Reporting, recording or classification may change
Official statistics include every incident automatically
After trying it yourself, choose your next review. This is your self-assessment.
Your review choice appears on Today. Sign in to sync it across devices.
Make it stick
Define crime and deviance, name one formal and one informal agency, and compare two crime measures.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.